Downloading and installing packages globally

Tip: If you are using npm 5.2 or higher, we recommend using npx to run packages globally.

Installing a package globally allows you to use the code in the package as a set of tools on your local computer.

To download and install packages globally, on the command line, run the following command:

npm install -g <package_name>

If you get an EACCES permissions error, you may need to reinstall npm with a version manager or manually change npm's default directory. For more information, see "Resolving EACCES permissions errors when installing packages globally".

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https://docs.npmjs.com/downloading-and-installing-packages-globally